#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "unity.h"
#include "mock_xrt1553B.h"  // 假设使用CMock生成的mock头文件
#include "ccsds1553.h"



// 测试用全局变量
static XRt1553B testInstance;
static B1553_BusService testBusService;
static u8 testDataBuffer[256];

/**
 * @brief 测试设置函数 - 在每个测试用例执行前调用
 */
void setUp(void)
{
    // 初始化测试数据
    memset(&testInstance, 0, sizeof(XRt1553B));
    memset(&testBusService, 0, sizeof(B1553_BusService));
    memset(testDataBuffer, 0, sizeof(testDataBuffer));
}

/**
 * @brief 测试清理函数 - 在每个测试用例执行后调用
 */
void tearDown(void)
{
    // 清理工作（如果需要）
}

/**
 * @brief 测试用例1: 当bytes参数为0时，函数应直接返回0且不调用底层函数
 * Test case 1: When bytes parameter is 0, function should return 0 directly without calling underlying function
 */
void test_rt_GetPosAltData_WhenBytesIsZero_ShouldReturnZero(void)
{
    // Arrange
    u32 result;
    u32 expected_result = 0;
    
    // 不需要expect任何mock函数调用，因为应该直接返回
    
    // Act
    result = rt_GetPosAltData(&testInstance, &testBusService, testDataBuffer, 0);
    
    // Assert
    TEST_ASSERT_EQUAL(expected_result, result);
}

/**
 * @brief 测试用例2: 当bytes参数大于0时，应调用XRt1553B_BCSTFromSubAddr函数并返回其结果
 * Test case 2: When bytes parameter is greater than 0, should call XRt1553B_BCSTFromSubAddr and return its result
 */
void test_rt_GetPosAltData_WhenBytesGreaterThanZero_ShouldCallXRt1553B_BCSTFromSubAddr(void)
{
    // Arrange
    u32 result;
    u32 bytes_to_read = 32;
    u32 mock_return_value = 0x12345678;
    
    // 设置mock期望 - 期望调用XRt1553B_BCSTFromSubAddr一次
    // 注意: B1553_POSALT_SUBADDR应该是已定义的常量
    XRt1553B_BCSTFromSubAddr_ExpectAndReturn(&testInstance, B1553_POSALT_SUBADDR, testDataBuffer, bytes_to_read, mock_return_value);
    
    // Act
    result = rt_GetPosAltData(&testInstance, &testBusService, testDataBuffer, bytes_to_read);
    
    // Assert
    TEST_ASSERT_EQUAL(mock_return_value, result);
}

/**
 * @brief 测试用例3: 边界值测试 - bytes = 1
 * Test case 3: Boundary value test - bytes = 1
 */
void test_rt_GetPosAltData_WhenBytesIsOne_ShouldCallXRt1553B_BCSTFromSubAddr(void)
{
    // Arrange
    u32 result;
    u32 bytes_to_read = 1;
    u32 mock_return_value = 0xABCDEF00;
    
    // 设置mock期望
    XRt1553B_BCSTFromSubAddr_ExpectAndReturn(&testInstance, B1553_POSALT_SUBADDR, testDataBuffer, bytes_to_read, 0);
    
    // Act
    result = rt_GetPosAltData(&testInstance, &testBusService, testDataBuffer, bytes_to_read);
    
    // Assert
    TEST_ASSERT_EQUAL(0, result);
}

/**
 * @brief 测试用例4: 大字节数测试
 * Test case 4: Large bytes test
 */
void test_rt_GetPosAltData_WhenBytesIsLarge_ShouldCallXRt1553B_BCSTFromSubAddr(void)
{
    // Arrange
    u32 result;
    u32 bytes_to_read = 256;
    u32 mock_return_value = 0xFFFFFFFF;
    
    // 设置mock期望
    XRt1553B_BCSTFromSubAddr_ExpectAndReturn(&testInstance, B1553_POSALT_SUBADDR, testDataBuffer, bytes_to_read, bytes_to_read);
    
    // Act
    result = rt_GetPosAltData(&testInstance, &testBusService, testDataBuffer, bytes_to_read);
    
    // Assert
    TEST_ASSERT_EQUAL(bytes_to_read, result);
}